Wordnet 3.0
NOUN (2)
1. 
 someone who drinks heavily (especially alcoholic beverages); 
- Example: "he's a beer guzzler every night"2. 
 a drinker who swallows large amounts greedily; 
[syn: gulper, guzzler]
The Collaborative International Dictionary of English v.0.48:
Guzzler \Guz"zler\ (-zl[~e]r), n.
   An immoderate drinker.
   [1913 Webster]
WordNet (r) 3.0 (2006):
guzzler
    n 1: someone who drinks heavily (especially alcoholic
         beverages); "he's a beer guzzler every night"
    2: a drinker who swallows large amounts greedily [syn: gulper,
       guzzler]